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I have problems with cross-compiling because the interwork libraries doesn't seem to exist on the expected placed (needed to use both ARM and thumb instructions).
There are hard references to thumb/interwork in the Makefiles:
../../ecrobot/lejos_osek.tmf:LIBPREFIX := $(GNUARM_ROOT)/arm-elf/lib/thumb/interwork
../../ecrobot/lejos_osek.tmf:LIBC := $(GNUARM_ROOT)/arm-elf/lib/thumb/interwork/libc.a
And this leads to the following error when issuing "make all" in the helloworld example directory:
/opt/gnuarm/bin/arm-elf-ld -o HelloWorld_ram.elf ../../lejos_nxj/src//nxtvm/platform/nxt/uart.o
[blah blah blah]
-T HelloWorld_ram.ld -Map HelloWorld_ram.elf.map -L/opt/gnuarm/arm-elf/lib/thumb/interwork -cref --gc-sections -L../../lejos_nxj/src//nxtvm/platform/nxt -L../../lejos_nxj/src//nxtvm/javavm -L../../ecrobot -lm /opt/gnuarm/arm-elf/lib/thumb/interwork/libc.a /opt/gnuarm/lib/gcc/arm-elf/4.0.2/interwork/libgcc.a
/opt/gnuarm/bin/arm-elf-ld: /opt/gnuarm/arm-elf/lib/thumb/interwork/libc.a: No such file: No such file or directory
make: *** [HelloWorld_ram.elf] Error 1
First I thought I needed an older GNU compiler chain, so I compiled the one with the gcc-4.0.2 compiler (instead of the gcc-4.1.1 I had used previously to compile for ARM processors), but this didn't make any difference. There is no thumb/interwork folder with that compiler either.
I have compiled with "arm-elf" as target (with "/opt/gcc-4.0.2/configure --target=arm-elf --prefix=/opt/gnuarm --enable-interwork --enable-multilib --enable-languages="c,c++" --with-newlib --with-headers=/opt/newlib-1.14.0/newlib/libc/include" and brothers). See:
Which GNU ARM toolchain have you used? And did you setup it with some additional flags perhaps?
Sorry, to have bothered you with this.
The --enable-interwork flag is not used to build the full-fledged cross-compiler when the appropriate variables in one of the config files isn't set.
It can be solved by uncommenting in the (on my system) /opt/gcc-4.1.1/gcc/config/arm/t-arm-elf file:
MULTILIB_OPTIONS += mno-thumb-interwork/mthumb-interwork
MULTILIB_DIRNAMES += normal interwork